Building on its patent-pending design that has taken the bearing category (and the speed record books) by storm, Seismic now introduces a 6-Ball version of the Tektonï¾ ï¾ constructed with fewer, larger, stronger balls than ordinary 608Z bearings. This means less total ball-raceway surface contact, less friction, quicker acceleration, higher speed, and longer life. The balls are rated P4, the highest grade available, which means a super-high degree of roundness, extremely smooth surfaces, and even more speed and durability. For extra credit, Seismic adds one of the most expensive lubes available. – All Tekton bearings feature wide, flat contact surfaces at the ends of integrated, custom-machined half-spacers. The broad flanges square up, co-align, and self-stabilize inside your wheels ï¾ correcting for flaws in bearing seat levelness, bearing seat spacing, axle diameter, and axle straightness. The Tektons literally block themselves from sitting or rocking out of alignment, so they stay straighter than any other bearing system ever. Your wheels roll faster with better control, while the bearings last longer and stay quieter. – Other features include: Dupont engineering-grade Nylon retainers, black outer casings, and removable rubber-coated steel seals with printed graphic. The inner race is specially contoured underneath the seal to resist contamination, and itï¾s stepped between the bearing and the flange to save weight. On the side opposite the flange, the inner race extends 0.5mm to form a thin integrated washer.